CN102052702A - Heating system and method by using power plant steam turbine bearing cooling water through heat pump - Google Patents
Heating system and method by using power plant steam turbine bearing cooling water through heat pump Download PDFInfo
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Abstract
本发明属于能源领域的一种电厂轴承冷却水热泵供暖系统及方法,该系统由汽轮机、汽轮机轴承冷却系统、蒸汽吸收式热泵、水水换热器、低压加热器、热网加热器以及相应的管路和附属设备组成。该系统利用电厂轴承冷却水作为吸收式热泵的低温热源,在汽轮机组中做过功的中压蒸汽为热泵的驱动热源,在吸收式热泵系统中换热,其疏水送到汽轮机组回热系统中作为锅炉给水,热泵系统获得的高温热源中的热量在冬天单独或和传统热电联产系统耦合向外供给热用户,在夏天通过水水换热器的回热加热器加热汽轮机组的凝结水提高锅炉给水温度。从而降低了电厂汽轮机组轴承温度,实现了机组的安全运行,并且将热量通过热泵向外输出供热,提高了汽轮机组的热经济性。
The invention belongs to the field of energy and relates to a bearing cooling water heat pump heating system and method in a power plant. The system consists of a steam turbine, a steam turbine bearing cooling system, a steam absorption heat pump, a water-water heat exchanger, a low-pressure heater, a heat network heater and corresponding Composed of piping and ancillary equipment. The system uses the bearing cooling water of the power plant as the low-temperature heat source of the absorption heat pump, and the medium-pressure steam that has done work in the steam turbine unit is used as the driving heat source of the heat pump. It exchanges heat in the absorption heat pump system, and its water is sent to the steam turbine unit for heat recovery system. As the boiler feed water, the heat from the high-temperature heat source obtained by the heat pump system is supplied to the heat user in winter alone or coupled with the traditional cogeneration system, and the condensate of the steam turbine unit is heated in summer by the regenerative heater of the water-to-water heat exchanger Increase boiler feed water temperature. Thus, the bearing temperature of the steam turbine unit in the power plant is reduced, the safe operation of the unit is realized, and the heat is output to the outside through the heat pump for heat supply, which improves the thermal economy of the steam turbine unit.
Description
技术领域technical field
本发明属于能源领域,特别涉及一种电厂汽轮机轴承冷却水热泵的供暖系统及方法,该系统通过电厂汽轮机轴承冷却水热泵的工作,降低了电厂汽轮机组轴承温度实现了机组的安全运行,另一方面将获得的热量通过热泵向外输出供热,实现了能量的梯级利用,提高了汽轮机组系统的热经济性。The invention belongs to the field of energy, and particularly relates to a heating system and method for a steam turbine bearing cooling water heat pump in a power plant. The system reduces the bearing temperature of the steam turbine unit bearing in the power plant through the operation of the steam turbine bearing cooling water heat pump in the power plant and realizes the safe operation of the unit. On the one hand, the obtained heat is output to the outside through the heat pump for heat supply, which realizes the cascade utilization of energy and improves the thermal economy of the steam turbine unit system.
技术背景technical background
热力发电厂汽轮机组的轴承冷却是影响机组运行安全的问题之一,汽轮机高速运行时,轴承内摩擦会产生大量的热量,如果轴承温度过高,会引起机组的振动甚至停机。机组运行中通过轴承内的润滑油系统不断循环流动能将这些热量带走,然后润滑油被另外的冷却水系统冷却,从而对机组运行起到散热冷却作用。实际运行中,这里的冷却水系统需要外界环境来进行冷却降低温度,大量的热量被浪费到环境中,另一方面,夏天由于环境温度高,冷却效果差,轴承冷却经常效果不佳影响整个汽轮机组的运行。The bearing cooling of the steam turbine unit in a thermal power plant is one of the problems that affect the safety of the unit operation. When the steam turbine is running at high speed, the internal friction of the bearing will generate a lot of heat. If the bearing temperature is too high, it will cause the unit to vibrate or even shut down. During the operation of the unit, the heat can be taken away by the continuous circulation of the lubricating oil system in the bearing, and then the lubricating oil is cooled by another cooling water system, so as to play a cooling role in the operation of the unit. In actual operation, the cooling water system here needs the external environment to cool down and lower the temperature, and a large amount of heat is wasted into the environment. On the other hand, in summer, due to the high ambient temperature, the cooling effect is poor, and the cooling effect of the bearing is often not good enough to affect the entire steam turbine. group run.
发明内容Contents of the invention
本发明提出一种电厂汽轮机组轴承冷却水热泵供暖系统及方法。The invention provides a heating system and method for a steam turbine unit bearing cooling water heat pump in a power plant.
一种电厂汽轮机组轴承冷却水热泵供暖系统,其特征在于该系统包括汽轮机、汽轮机轴承冷却系统、蒸汽吸收式热泵、水水换热器、低压加热器和热网加热器;该系统的汽轮机1的机轴连接汽轮机轴承冷却系统3,汽轮机轴承冷却系统3通过循环冷却水管路连接蒸汽吸收式热泵7的蒸发器7-2;汽轮机1的抽汽通过管道连接蒸汽吸收式热泵7的发生器7-1,发生器7-1中冷却后形成的疏水的通过疏水管道连接到汽轮机回热系统的低压加热器6的给水侧;蒸汽吸收式热泵7的冷凝器7-4的供水端连接供水三通阀9,供水三通阀9的一路连接供给热用户11的热网加热器10,冷凝器7-4的的回水端通过回水三通阀8连接供给热用户11的热网加热器10形成水循环回路;供水三通阀9和回水三通阀8分别连接汽轮机回热系统的水水换热器5高温水侧管路两端;汽轮机回热系统的水水换热器5的低温水侧的两端分别连接低压加热器6的给水侧和凝结水泵4侧相关对应温度的回热加热器出水端。A steam turbine unit bearing cooling water heat pump heating system in a power plant is characterized in that the system includes a steam turbine, a steam turbine bearing cooling system, a steam absorption heat pump, a water-to-water heat exchanger, a low-pressure heater and a heat network heater; the
一种电厂轴承冷却水热泵的供暖方法,其特征在于,所述电厂轴承冷却水热泵供暖是利用电厂汽轮机轴承冷却水作为吸收式热泵的低温热源,通过发电汽轮机中做过功的较低压力的蒸汽作为热泵的驱动热源,热泵高温热源获得的热量在冬天用于供暖,在夏天连接汽轮机的给水加热系统加热锅炉给水。A heating method for a bearing cooling water heat pump of a power plant, characterized in that the heating of the bearing cooling water heat pump of the power plant uses the cooling water of the bearing cooling water of the steam turbine of the power plant as the low-temperature heat source of the absorption heat pump, and uses the low-pressure heat generated by the work done in the power generation steam turbine Steam is used as the driving heat source of the heat pump. The heat obtained by the high-temperature heat source of the heat pump is used for heating in winter, and the feed water heating system connected to the steam turbine is used to heat the boiler feed water in summer.
本发明的有益效果是一方面降低了电厂汽轮机组轴承温度实现了机组的安全运行,另一方面热泵系统高温热源中获得的热量在冬天向外供给热用户,在夏天通过换热器加热汽轮机组的凝结水提高锅炉给水温度。The beneficial effect of the invention is that on the one hand, the bearing temperature of the steam turbine unit in the power plant is reduced to realize the safe operation of the unit; on the other hand, the heat obtained from the high-temperature heat source of the heat pump system is supplied to the heat user in winter, and the steam turbine unit is heated through a heat exchanger in summer The condensed water increases the boiler feed water temperature.
附图说明Description of drawings
图1是电厂汽轮机组轴承冷却水热泵的供暖系统结构形式示意图。Figure 1 is a schematic diagram of the structural form of the heating system of the steam turbine unit bearing cooling water heat pump in the power plant.
图中:1是汽轮机,2是凝汽器,3是汽轮机轴承冷却系统,4是凝结水泵,5是水水换热器,6是低压加热器,7是蒸汽吸收式热泵,8是回水三通阀,9是供水三通阀,10是热网加热器,11是热用户,7-1是发生器,7-2是蒸发器,7-3是节流装置,7-4是冷凝器。In the figure: 1 is the steam turbine, 2 is the condenser, 3 is the cooling system of the steam turbine bearing, 4 is the condensate pump, 5 is the water-water heat exchanger, 6 is the low-pressure heater, 7 is the steam absorption heat pump, 8 is the return water Three-way valve, 9 is a water supply three-way valve, 10 is a heat network heater, 11 is a heat user, 7-1 is a generator, 7-2 is an evaporator, 7-3 is a throttling device, 7-4 is a condensation device.
具体实施方式Detailed ways
本发明提出一种电厂汽轮机组轴承冷却水热泵供暖系统及方法。The invention provides a heating system and method for a steam turbine unit bearing cooling water heat pump in a power plant.
下面结合附图和具体实施例进一步详细描述本发明。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
实施例1Example 1
图1是电厂汽轮机组轴承冷却水热泵的供暖系统结构形式示意图,该系统包括汽轮机、凝汽器、汽轮机轴承冷却系统、蒸汽吸收式热泵、凝结水泵、水水换热器、低压加热器、供回水三通阀、热网加热器以及附属设备等,采用相应的管路连接组成。Figure 1 is a schematic diagram of the heating system structure of the steam turbine unit bearing cooling water heat pump, the system includes a steam turbine, condenser, steam turbine bearing cooling system, steam absorption heat pump, condensate pump, water-water heat exchanger, low-pressure heater, supply The return water three-way valve, heating network heater and auxiliary equipment, etc., are composed of corresponding pipeline connections.
具体工作流程如下:汽轮机1的排汽进入凝汽器2中凝结为水,经凝结水泵4、低压加热器6等组成的回热系统后送往锅炉作为给水;汽轮机1在高速旋转中放出的热量通过汽轮机轴承冷却系统3冷却,循环水冷却管路连接蒸汽吸收式热泵7的蒸发器7-2作为吸收式热泵7的低温热源;汽轮机1中做过功的抽汽通过管道连接蒸汽吸收式热泵7的发生器7-1,该蒸汽作为吸收式热泵7的驱动热源,蒸汽放热后被冷却,冷却形成的疏水通过疏水管道连接到汽轮机回热系统的低压加热器6作为锅炉给水的一部分;冷凝器7-4为蒸汽吸收式热泵7的高温热源,它向外界放出热量,冷凝器7-4中的高温水连接供水三通阀9;在冬天,通过供水三通阀9的切换,蒸汽吸收式热泵7产生的高温水供给热网加热器10并进一步供给热用户用于供暖;在夏天,通过供水三通阀9的切换,蒸汽吸收式热泵7产生的高温水通过水水换热器5加热汽轮机回热系统的给水;热网加热器10和加热器5都是水水换热器,其回水都连接回水三通阀8,通过三通阀连接蒸汽吸收式热泵7的冷凝器7-4,形成水循环回路;节流装置7-3连接在冷凝器7-4和蒸发器7-2的一端,发生器7-1连接在冷凝器7-4和蒸发器7-2的另一端。The specific working process is as follows: the exhaust steam of
最后,还需要注意的是,以上列举的仅是本发明的具体实施例。显然,本发明不限于以上实施例,还可以有许多变形。Finally, it should also be noted that what is listed above are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible.
本发明可用其他的不违背本发明的精神和主要特征的具体形式来概述。因此,本发明的上述实施方案都只能认为是对本发明的说明而不能限制本发明,权利要求书指出了本发明的范围,而上述的说明并未全部指出本发明的范围。因此,在与本发明的权利要求书相当的含义和范围内的任何改变,都应认为是包括在权利要求书的范围内。The present invention may be embodied in other specific forms without departing from the spirit and main characteristics of the invention. Therefore, the above-mentioned embodiments of the present invention can only be considered as descriptions of the present invention and cannot limit the present invention, and the scope of the present invention is pointed out by the claims, but the above-mentioned explanations do not all point out the scope of the present invention. Therefore, any changes within the meaning and scope equivalent to the claims of the present invention should be considered to be included in the scope of the claims.
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Cited By (9)
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CN102345895A (en) * | 2011-07-20 | 2012-02-08 | 双良节能系统股份有限公司 | Steam-water heating system for thermal power plant |
CN103090358A (en) * | 2013-01-23 | 2013-05-08 | 中国神华能源股份有限公司 | Cooling water heat recovery system of power plant and heat recovery method |
CN104776479A (en) * | 2015-04-02 | 2015-07-15 | 南京祥源动力供应有限公司 | Energy-saving boiler shaft waste heat recovery system |
CN105546564A (en) * | 2016-01-06 | 2016-05-04 | 浙江浙能节能科技有限公司 | Energy-saving recycling system for low-grade heat energy in smoke pollutant treatment of thermal power plant |
CN106150567A (en) * | 2016-07-26 | 2016-11-23 | 中国神华能源股份有限公司 | Steam turbine synergistic device and the synergisting method of steam turbine |
CN107939464A (en) * | 2017-12-21 | 2018-04-20 | 西安热工研究院有限公司 | A kind of CHP Heating System and method of work based on absorption heat pump cycle |
CN111780195A (en) * | 2020-05-18 | 2020-10-16 | 华电电力科学研究院有限公司 | A supercritical unit improved heat network hydrophobic system and its working method |
CN115046189A (en) * | 2022-05-24 | 2022-09-13 | 山东电力工程咨询院有限公司 | Feedforward compensation based power plant condensed water system cooperative control system and method |
CN116358020A (en) * | 2023-03-23 | 2023-06-30 | 山西漳山发电有限责任公司 | Multistage regenerative heating system for thermal power plant |
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CN102345895A (en) * | 2011-07-20 | 2012-02-08 | 双良节能系统股份有限公司 | Steam-water heating system for thermal power plant |
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CN103090358A (en) * | 2013-01-23 | 2013-05-08 | 中国神华能源股份有限公司 | Cooling water heat recovery system of power plant and heat recovery method |
CN104776479A (en) * | 2015-04-02 | 2015-07-15 | 南京祥源动力供应有限公司 | Energy-saving boiler shaft waste heat recovery system |
CN105546564A (en) * | 2016-01-06 | 2016-05-04 | 浙江浙能节能科技有限公司 | Energy-saving recycling system for low-grade heat energy in smoke pollutant treatment of thermal power plant |
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CN107939464A (en) * | 2017-12-21 | 2018-04-20 | 西安热工研究院有限公司 | A kind of CHP Heating System and method of work based on absorption heat pump cycle |
CN107939464B (en) * | 2017-12-21 | 2024-03-01 | 西安热工研究院有限公司 | Combined heat and power generation heating system based on absorption heat pump cycle and working method |
CN111780195A (en) * | 2020-05-18 | 2020-10-16 | 华电电力科学研究院有限公司 | A supercritical unit improved heat network hydrophobic system and its working method |
CN111780195B (en) * | 2020-05-18 | 2021-09-03 | 华电电力科学研究院有限公司 | Supercritical unit improved heat supply network drainage system and working method thereof |
CN115046189A (en) * | 2022-05-24 | 2022-09-13 | 山东电力工程咨询院有限公司 | Feedforward compensation based power plant condensed water system cooperative control system and method |
CN115046189B (en) * | 2022-05-24 | 2025-02-28 | 山东电力工程咨询院有限公司 | Coordinated control system and method for condensate system in power plant based on feedforward compensation |
CN116358020A (en) * | 2023-03-23 | 2023-06-30 | 山西漳山发电有限责任公司 | Multistage regenerative heating system for thermal power plant |
CN116358020B (en) * | 2023-03-23 | 2025-06-13 | 山西漳山发电有限责任公司 | A multi-stage heat recovery heating system for thermal power plants |
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